Only APs with like radios can mesh together.
Single-band (2.4G) only APs mesh on 2.4G, shared with clients. Dual-band APs mesh on 5G, and accept 5G clients, leaving 2.4G all for clients.
But... like radios also means b/g versus b/g/n.
Old 2925/2942/2741 are single-band 802.11b/g only, and can mesh together on 2.4G.
Newer 7942/7343 were single-band 802.11b/g/n, and can mesh together on 2.4G.
Dual-band APs with n on both bands, include 7962/7762/7363/7982/7782, and these APs can mesh together on 5G backhaul for both band clients.
What makes 7782 greater than 7762 is radio antennas and streams.
ZF7982 is 3x3:3, and ZF7962 is 3x3:2 spatial streams.
--
You have 7363 model APs with 2x2:2 antennas and spatial streams.
ZF7762 will be the correct choice as ZF7982 will offer no better performance.