yes but I was more looking for battles between them in their championship years at McLaren when they were racing together in one team
In 1988, Senna past Prost for the lead in Canada, after Prost passed Senna at the start. It wasn't that exciting - Senna stalked Prost for a bit and then passed him.
France has already been mentioned. One of the best battles over the two years, where Prost passed Senna to win.
At Hungary, Prost qualified quite far down, but once he'd cleared the pack he caught Senna, and briefly passed him into turn 1 before going too wide to keep the position.
At Portugal, Senna squeezed Prost towards the wall while Prost past him. Not much of a battle though. That was at the start of lap 2 and Senna went backwards after that.
In Japan, Senna caught and passed Prost after ending up in the midfield following a terrible start.
They had much less to do with each other in 1989, with Senna generally ahead when running problem free. The was the infamous pass at San Marino that led to Prost being annoyed with Senna. Prost stayed close for a while in that race before ultimately falling back and then spinning (I think he had brake problems). They were running fairly close at Silverstone when Senna spun off with a gearbox problem. Hockenheim has been mentioned where Prost lost the lead with a couple of laps to go. Prost got the lead initially after he had the slightly less slow of the two awful McLaren pitstops, but it was fairly close between them in the first stint. And then obviously Japan.