Hello,

CSIR NET is mainly for science subjects such as mathematical science/chemical science/biological science/earth science/physical science, and on the other hand UGC NET has a total of 81 subjects

Yes, JRF is available for both CSIR NET as well as UGC NET, the eligibility criteria for each one has been mentioned below-

CSIR NET - Passed BTech/Bpharm/BS degree of four years/Integrated MSc or BS-MS securing 55% aggregate are also eligible to apply, for reserved category they need merely 50%,

UGC NET -  Passed  master's degree in the relevant discipline from a recognized university securing  55% aggregate, for reserved category there is relaxation of 5%

You can check the last year cut-offs of the respective entrance test to know more details regarding this

UGC NET cut-off: https://competition.careers360.com/articles/ugc-net-cutoff

CSIR NET cut-off: https://competition.careers360.com/articles/csir-ugc-net-cut-off