There are no restrictions on which brand kit you use for robo-cross as long as all the rule requirements are met, particularly section 2 Construction Requirements.
We cannot rule ahead of time whether your implementation of a particular kit or brand meets the requirements.
The 2X bonus applies to ALL items of a given type if at least one item of that type is in each jug. Example, one ping pong ball in jug 1, one in jug 2 and two on the playfield in any zone. All four get the 2X bonus. Note, if a ball is in zone A or B two times zero is still zero of course.