Whats the capacity of your "60 AGM Solar Battery" ?
Does this mean 60 amphour or is it a group 60 AGM battery?
If its deepcycle 60ah AGM, it might work.
Variables include just how dead your group 35 is, how quickly your motor will normally fire up & and the ampacity of the jumping connection.
any agm battery should be able to jump it, the bigger the better. The little jump pack is just a 17ah agm battery. I have a small 28ah agm battery that I have actually used as a start battery on my astrovan, used it for several days with no problem.
Even if for some reason it wont jump it (cause the wires are too small) , just connecting a full agm to a dead battery for a few minutes, maybe 15 minutes, can bring the dead battery up to where you can get at least one good crank.