Breadcrumb navigation with URL ending

[Motava]

Will it make a difference if a page has this format for URLs and breadcrumb navigation

www.domain.com/category.html
www.domain.com/category/product1.html

vs.

www.domain.com/category/
www.domain.com/category/product1.html
or
www.domain.com/category/product1

does it make sense to change the category page or will it not make a huge difference?

[AdamThompson]

I would consider either to be fine.