CPU compatibility

Hi there.. I have recently bought a secondhand averatec 4200 series laptop. It is running a 1.6Ghz pentium m 730 CPU and unforunatelly the only avaiable info on the CPU is the chipset: it is 915gm.. anything else about the board is simply unknown (I also know that the top speed that the board can support is 1.6ghz and that it runs with 533mhz). My question is: can I put a pentium m 725 1.6ghz (which differs form the one I have at the moment just by the bus speed which in this case is only 100mhz instead of the 133mzh on the one I have at themoment) processor on the board? is it gonna run on the board without a bios update? and also, what is the difference in power processing between the two cpus? THank you in advance for your help.
regards