Both models have been rumored for some time now and one of the interesting things is that they have better specifications than the desktop counterparts.
The number of CUDA cores, texture units, ROP units and the base frequency is identical to the desktop versions, but both parts have higher frequencies. While the desktop GTX 1050 has a 1354MHz base and 1455MHz Boost, the mobile GTX 1050 has a 1354MHz base and 1493MHz Boost. Similarly, the GTX 1050 Ti desktop has a 1290MHz base and 1392MHz Boost frequency, while the laptop model has a 1493MHz base and 1620MHz Boost frequency!
Another key difference is that the mobile GTX 1050 will come with up to 4GB GDDR5 memory, while the desktop model is limited to 2GB.