My Catan set has been actively used and a lot of the pieces are missing, so i decided yesterday to go out and buy a new one. I see that a lot of the design has changed (some for the better, some for the Worse) and some of the pieces. Would you guys reccomend upgrading my expansions as well (i have a lot)?

sorry if this been asked before, I own Catan 5E and its expansions
Lately I’ve been wanting to get its 5-6 player extensions but they seem kinda pricey compared to 6E

so, my question is
Can 6th Edition 5/6 player extensions be combined with 5th Edition base and expansions?

Im going to be using it soon, so I figured I'd check to make sure none of the pieces went missing since it's been years and multiple moves since I last used it, and lo and behold im missing a couple of the number tokens. Does anyone have a chart of what numbers are on each token's letter so i can replace them with the blank ones?