Two days ago, I upgraded two Netware 6.5 Servers to SP7. Today I installed a new third server with 6.5 SP7. When I run dsrepair and check synchronization, I get the following

Server 1 DS Version 10553.73
Server 2 DS Version 10510.64
Server 3 DS Version 20216.51 (NEW)

Do I need to upgrade the Edirectory on the first two servers? If so, what risk do I run, and how soon would I need to do that? Please advise.