Apex 1.5 will not import data from other brands of field devices.   I have not seen the Apex 2.0 beta.   AgLeader's pending SMS 7.5 is supposed to read data from the GS2 (and existing versions read data from GS1).   Maybe the AFS software will also be updated (Ag Leader builds it for CNH) and you can use it to read both sets of data.

Did you really log the data from two brands of monitors onto the same card?   I had not heard of doing that.  I scares me, but maybe there is not a real big downside.  One thing I can think of is that some software uses "auto-detect" when a card is inserted into a computer.   Those routines would find data from GS2 and quit before discovering the data from CNH, or vice versa.   So you would have to jump through some hoops to read data from both devices.