nRF5340-CMAA replacement?

[Greg0]

For just a first test board off of Thingy 91x design, can nRF5340-CMAA be replaced with nRF5340-CLAA? What's the downside of doing that? Documentation says it's not recommended for new designs, but can't find details.

[Samuel Carey]

Can you please confirm if the CLAA will or will not fit on CMAA pads? Also, please confirm that the RF will require different matching characteristics. The CMAA is currently unavailable and I need to know if I can use CLAA as a replacement.