It sounds like you ' ve got one strip of addressable RGB LEDs and one strip of nonaddressable RGB leds . What are you connecting them tocontrolling with ? The best you can do in terms of interacting with each other is use the nonaddressable like one giant pixel and coordinate it with the addressable ones , depends if you ' re using something like an arduino or what though and you ' d need to make a simple circuit for driving the nonaddressable strip . In terms of connecting power together then you could also run both from the same power supply if they ' re definitely the same voltage nonaddressable is generally 12 v and addressable is most often 5 v so if they ' re the same you have something slightly less common for one of them . Just check it can provide enough amps . Edit I need to read better . The 2 4 pin strips should work together and both sound like nonaddressables , do they both work if tested independently ?