I think it depends on how deeply you know both properties. For those of us that are deeply familiar with both, sure, the differences may seem like a bigger deal than the similarities. But to folks who are only familiar with one, or only passing familiar with both, they're gonna seem pretty similar. Elves and dwarves and dragons and rangers and balrogs ooops I mean balors and so on.
Tolkien himself was inspired by norse myth and other folklore, and D&D was influenced by a lot of folklore, too, so it makes sense that they'd be very similar.