Yes, but there are always going to be minor changes during each revision. Before the MAX there were the -600, -700, -800, and -900 series 737s. Before that, the

Yes, but there are always going to be minor changes during each revision. Before the MAX there were the -600, -700, -800, and -900 series 737s. Before that, the -300, -400, -500 series. Each set will invariably have a few things that pilots will have to be aware of. In this case, Boeing didn’t alert pilots to the new MCAS system, which is a giant failure on their part. It’s not yet known if this latest crash is in any way related to the first (although I have several outstanding wagers against this being the case).