Here in NYC the GE and Murray apnels are iterchangeable, except for the GE slimline type breakers. In fact a lot of supply houses are only carrying one or the other to lighten their stock.
I believe that there was a buyout, but both lines will remain on the market to support the older products.
What is not acceptablt is to change only the panel without changing the meter pan and service entrance conductors to ones applicablt to the new amperage.