Probably true. I vaguely remember the switchover. That was a fun time of flamewars between the Keyes and Buchanan supporters, I recall.
I don't recall any such flamewar.
In fact, while I voted Buchanan/Reform in the Y2K general election, I also voted for Keyes in the Y2K Michigan GOP primary. Of all the conservative candidates running that year, I thought Buchanan and Keyes had the most in common. If Keyes would have received the GOP nomination instead of Dubya that year, I probably would have voted for him instead of PJB in the general election.
Nope, I thought I got along well with the Keyes supporters.
Same with the Quayle, Forbes, Bauer and Smith supportors.
But those further to the left (Nader, Gore, McCain, Bush, Browne, Hagelin) usually instigated greater conflict.