Imho Pereira just land heavier strikes then Jiri and it will be enough to win. I really doubt Jiri gonna have an advantage on the ground, because that is not just his field. It will be pure kickboxing vs muay thai, where reach and power of Pereira would do all the work. Pereira won Polish power, and he had better wrestling than Jiri. Also Jiri is less powerfull than Blachowicz. Plus Jiri would be cautious because of operatuon he had.
I think that's how it will likely go down. Prochazka will probably try his luck and attempt to out-strike Pereira, if that fails, he'll have no choice but to attempt to take it to the ground. It won't be easy though. Pereira's base sport might be kickboxing, but he spent last few years on mastering takedown defence, so won't be as vulnerable as many may think.
I'm not sure if Pereira's fight against Blachowicz is good indication of anything. I have a lot of sympathy to Jan (he's my compatriot) but he's way past his prime. He's cardio is lacking and it affects his entre game. Prochazka is in his prime years and still has that drive and right mentality, whereas Pereira' main goal is likely to earn as much as possible before retiring in 2-3 years.
It's going to be an interesting one for sure.