Brno ZKK 602 barrel thread is a standard M28x2 with 60 degree thread form. The Mauser 98 used a 1.100" x 12 TPI with 55 degree thread form. Close and maybe forceable, just depends on how great a butcher you want to be :-).

Seriously, if the ZKK barrel is in such good condition that it justifies putting into another action then sell it to a ZKK owner and use the money to buy a new barrel specifically for the Mauser 98. (Aussie barrel makers Swann, Tobler, TSE etc will all do a barrel for a Mauser.)