As one who has refoamed and recapped loads of speakers I'll tell you. The difference will be subtle and probably the only way you will be able to tell the difference would be to do a side by side with a pair that have never been played.
Modern speaker surrounds appear to be of a better compound than ones like Infinity, Polk, Boston, etc. that literally self destructed right before your eyes. Vintage audio is like hotcakes right now. Don't baby your new speakers, but also don't beat them for awhile. Just get the surrounds exercised moderately and you'll be golden.