How does a stock swap work in MnA usually?

Assume company A (acquirer) worth 20mln buys out company B (target) worth 500k. The deal implies 100k cash and the rest equity in the target.

Would it be common for the target to agree to pay out the shares through a vesting schedule while the founders of the target work at the company. How long should that vesting schedule be and would a deal that would imply 1 year cliff and 3 years vesting thereafter be something that is common in the MnA world or would something as such be considered a "bad" deal for the founders of the target?

19yo doing some digging - studying Econ atm!