rojo, put you r location in, the folks here at retrobike are a nice bunch even if if never met them. Someone may be down the road from you or near you and may love to have a fettle and chat to help you build up a bike (and may have the all important tools)
I'm 5' 9½" and I ride a 20" bike, I have a 18½" bike also of a similar design that is ridable as long as the seatpost is very long but really is too small, fun but too small. Both retro ('91/'92).
So use the 19/20" only as a guide. The only way is to try them out, if you have any old pictures of the Kona you had post them and people here are pretty good at telling you what size it'll be. That and every other last bit of details even down to tube thickness it had
I wouldn't have a clue what size I would ride with a modern setup as the frame design have changed and the front especially has altered. I would have to go to a Local Bike Store, even <god forbid, (Cardiff excluded
So another way would be to go to a local retrobike meet if there is on and try them out.
Of course, buy and sell on if it's not right works as well.