at full compression, your current shock will be (nominally anyway)
200-50=150mm
the new one will be
190-50=140mm
That 10mm is the wheel further “up” its travel than was originally achievable, so you have to be sure that this won’t let the tyre foul the frame or snap/dent some part of the rear end or linkages
(as ^ they said, let out all of the air of your current shock and see where that gets to when compressed, then take out the shock and let the suspension move even further and you should know if it’s a goer)
(alternatively, google it – I bet someone’s had a go before you)