Could you try with either 14.1x53-D40 or D42 on both EX4600 and QFX5100? If works on QFX5100, it should work on EX4600 as [basically] the same product.
The code version you have listed for QFX5100 (13.2X51-D36) does not look right, as really old. Actually this code version is not even listed on Support download site.