With most newer receivers there's a speaker range and a subwoofer range setting. Having them different say 40 mixed with 80 shouldn't mismatch.
I have my subs at 80hz with my fronts large{40hz} and center Vp160 at 60hz and surrounds at 80hz no problem.

That 80hz all around is more of a THX recommendation, than anything else. The different channels in your receiver should cross them over without being to big a difference in channel separation.