I need a small solar charge controller for a 4.2V battery and a 5V solar panel. In my research, I found the SD05CRMA and the SDBK03TA 4V2.

Both use a 472 and a 1201 resistor. They both also use a CN3163 mppt lithium ion battery charge controller.

I see no other differences besides price.

Are there any benefits of one over the other in terms of physical architecture?

SDBK03TA

SD05CRMA