Yes, you can copy a signal with a different broker but you should check the slippage between the 2 brokers first, under the slippage tab.
The green values are best but you could try under a yellow value too.
If you can't find the desired signal in your MT4 platform's signal tab, you can search for it in the upper right corner (search area).
I don't see my broker under the slippage tab... what would that mean? Thanks.
That no subscriber has copied this signal so far using your broker.
You could try at your own risk and see how it goes.
You could even ask the signal provider about it.