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Clears will be quite a bit heavier than reds, plus they have a tactile bump half way down.
Topre 45g is allegedly the same weight as MX reds, but due to the different force curve they feel slightly heavier.
The best idea is, if you can, try each of the keyboards before buying, which usually means finding a retailer near you or a friend who is willing to let you try a few keyboards, or see if you are near one of the meetups that is scheduled.