How different is Peru than Central America?

My past few trips have been Belize, Puerto Rico, Mexico, and Costa Rica. I love going to spanish speaking & latin american places. For this summer I really wanted to go Asia - ideally Vietnam or Japan (would be second visit), but flight prices are steep and I'm learning the summers there are extremely hot.

With that, Peru seems to be quite the adventure and July-Sept is a great time to visit.

Will it feel a lot different than the previous places I've visited or will it feel like a brand new experience?

Also, am I being dramatic about the heat in Asian countries? If I can find a reasonable flight to Tokyo I’d probably head north to Hokkaido.