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We can't tell without pictures...

It would be a hard sell.

I have no idea but does not sound good to me. They do not match and just because they are both white does not make them match. Does the fabric actually match ? We need pictures for sure posted here in a comment.

It could work. I always thought the sofas in this room were exactly the same, until I took a closer look.

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These seem to be from the same brand, but if everything is slip-covered in white and intentional, then it wouldn't matter if one of the sofas was a slightly different shape. I think the sofas need to close enough in style/size, so I wouldn't pair a very traditional bulky sofa with a very modern sleek sofa.

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Color isn’t a factor unless someone wants matching…it’s the style, size, shape and fabric details that are. You mentioned the slipcover, does the new couch work with that look and can you provide pictures?

Waiting for pics