Is a GFCI Wallplate Cover a different size then a Rocker Switch cover?
NO, however as stated before they make a mini, midi, large , and extra large plate for all devices.
So you have to match up what you have to make sure it is same size if you have to have it that way to cover up something that needs it.
Of course if you are referring to the holes and shape of course they are different, as far as what type of device it is to cover.
Good Luck 
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Single-Gang Recessed Indoor INBOX™
 Leviton 80401-W 1-Gang Decora/GFCI Device Decora Wallplate, Standard Size, Thermoset, Device Mount, White List Price: Sale Price: $0.01 You save: $0.58 (98%)  Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionLeviton 80401-W Residential-Grade Decora Wallplate (White)  |
 Leviton 80405-W 2-Gang 1-Toggle 1-Decora/GFCI Device Combination Wallplate, Standard Size, Thermoset, Device Mount, White List Price: Sale Price: $0.01 You save: $1.58 (99%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionLEVITON 2-G DECORA/GFCI TOGGLE WALLPLATE Leviton non-flammable thermoset wallplates provide flush-fitting warp resistant performance even in problem areas.Easy to clean smooth surface;no recessed areas to collect dirt or discolor... |
 Leviton 80421-W 2-Toggle 1-Decora/GFCI Device Combination Wallplate List Price: Sale Price: $0.22 You save: $9.39 (98%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product Description3 gang, 2 toggle, 1 decorative/GFCI device combination wall plate. Standard size, thermoset, device mount. |
 Leviton 84409-40 2-Gang Decora/GFCI Device Decora Wallplate, Device Mount, Stainless Steel List Price: Sale Price: $1.02 You save: $11.16 (92%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product Description2-Gang Decora/GFCI Device Decora Wallplate, Standard Size, 302 Stainless Steel, Device Mount, - Stainless Steel , UPC: 07847743514 |
 Leviton 80409-W 2-Gang Decora/GFCI Device Decora Wallplate, Standard Size, Thermoset, Device Mount, White List Price: Sale Price: $0.01 You save: $1.18 (99%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionDecora-Style single and multi-gang wallplates are available in nylon, urea and/or metal, and in a variety of colors or materials. Each features two or more Decora-style openings, ideal for any Leviton Decora insert, including GFCIs, electrical devices, lighting controls and Decora Multimedia QuickPort Inserts... |
 Leviton P326-W 4-Gang 3-Toggle Decora/GFCI Device Combination Wallplate, White List Price: Sale Price: $3.80 You save: $6.01 (61%) Eligible for free shipping!Availability: Usually ships in 4-5 business days See Reviews For This Product Description4-Gang 3-Toggle 1-Decora/GFCI Device Combination Wallplate, Standard Size, Thermoset, Device Mount - White, UPC: 07847782753 |
 Leviton 80608-W 2-Gang 1-Blank 1-Decora/GFCI Device Combination Wallplate, Midway Size, Thermoset, White List Price: Sale Price: $2.72 You save: $5.31 (66%) Eligible for free shipping!Availability: Usually ships in 4-5 business days See Reviews For This Product Description2-Gang 1-Blank 1-Decora/GFCI Device Combination Wallplate, Midway Size, Thermoset, Strap Mount - White, UPC: 07847749248 |
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 Amerelle 84R4N Steps Cast Metal Four Rocker/GFCI Wallplate, Satin Nickel List Price: Sale Price: $12.12 You save: $5.87 (33%) Eligible for free shipping!Availability: Usually ships in 24 hours See Reviews For This Product DescriptionAmerelle wallplates do more than just cover electrical boxes. They are an easy and inexpensive way to add a decorative accent to any room by matching or complementing other design elements such as cabinet hardware, plumbing and lighting fixtures, flooring, wallpaper, and more... |
 Leviton 88601 1-Gang Decora GFCI Device Decora, Wallplate, Oversized, Thermoset, Device Mount, White List Price: Sale Price: $1.20 You save: $1.68 (58%) Eligible for free shipping!Availability: Usually ships in 1-2 business days See Reviews For This Product DescriptionSold as each. 1 gang. Decora GFCI wallplate. Oversized. Thermoset plastic. For residential and light commercial use. Resistant to fading, discoloration, grease, oils, organic solvents and moisture scratches... |
