Question about early vs. late tops Options

[DC_neun_vierzehn]

I know there are two different tops (early vs. late).

My question is can an early top work on a late car IF the rubber seals on the sides have been updated (to match the late windows) AND the bump stops have been swapped (to match the late latches)?

The reason I ask is that I have two spare tops (one early and one late). I have them both stripped down (no rubber, no hardware, no felt headliner, etc.). Just the fiberglass top. And I noticed that the early top much lighter. I weighed them and the early top is approx. 17 pounds whereas the late top is approx. 23 pounds.

I'm not looking to shed weight for performance (although that's a bonus), but a lighter top would be less cumbersome to take off and put on the car.

TIA

-Kris

[fixer34]

FWIW, I did the exact opposite to my '70 over 40 years ago. Don't remember why, but I picked up a newer style top with the felt headliner and began using that one. Original top is long gone, probably tossed during a move.
I also replaced the rubber strips along the door sides, but couldn't tell you if they were early or late style.
Top goes on and all latches snap in place. Windows don't go all the way up to seal, but this probably more due to alignment in the doors.