Not really, Gill uses an optical cable to communicate with the IR sensor on the missile during flight, mostly guiding it manually (man in the loop), Thus giving it NLOS (non-line of sight) capability IE you can fire behind cover and hit a target which might be also behind cover. The disadvantage is that human in the loop means that human error can happen. The Jav on the other end locks the target with the CLU and feeds it to the missile just before launch and then it's completely fire and forget. the disadvantage is that it requires LOS to the target during the targeting phase. also the minimum range of the jav is better (shorter), in CM at least.
Overall in CM the jav is better simply due to the fact that the NLOS capability of gill is not modeled, which is fine cause it's an ancillary weapon system for a specific module after all.