attached is what your reel tapes should look like ... the 873-4zz uses m-222-[97-99]. SEF = "fat seven".
since the 4ZZ is a lightning/jackpot only game, I woulda thought payouts weren't that common. If you get a chance, post a pic of the payout table.
tmi below
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changing the payback requires changing the slotted index discs attached to each reel and changing the reel tapes to match the index discs....and possibly changing the reel wipers, wiring and payout disc.
swapping the reels around may or may not work ... e.g. there's no guarantee that the index disc slot depth for a seven on reel 2 is the same as the slot depth for a seven on reel 3.
if you have a single line game, you have a decent chance that swapping reels or replacing index index discs/tapes will work without needing to rewire the wiper contact plates or modify the wipers.
if you have a 3 or 5 line machine, you'd have an almost zero chance. The 3/5 line games reel contact plate wiring is complex and matched to traces and extra wipers available on the payout counter. The index disc slot depths have to account for the symbols on all paylines, not just the center one.
for example on reel 1, the slot depth may be different for a bar on the top line depending on what symbol is on the bottom line because the wipers need to be positioned differently on the reel contact boards.