Images on Website for SEO

[Prime85]

Good Morning,

We have a magento website with hundreds of different products that have slight size variations.

The image for each of these products looks the same (the only difference between the products is some of the dimensions) ....

Would you recommend using the same image for each of these products and just use a generic file name that describes the overall product or would you give each product its own image with it's specific product name as the file name?

Should I use 1 image for 500 different sku's or should i rename the file the name of each individual sku and load an individual image?  The end user will not know the difference since all of the images will appear identical, simply asking from an SEO perspective.

Thanks

[paints-n-design]

if there is no difference, why try to do as if? 
If the products are similar and the image is the same I usually take the same image.

I don't know the shop and products, but if the products are the same, even the description, content and so on, you should think about using a canonical tag (from an SEO perspective):
https://moz.com/blog/canonical-url-tag-the-most-important-advancement-in-seo-practices-since-sitemaps