Spot the difference:
… versus:
The regulator on the top is an LP2950-3.3, the regulator on the bottom is an MCP1702-33. Same voltage, same TO-92 package, different pinout. The board was designed for the LP2950, but the MCP1702 is cheaper and can supply more power (250 mA vs. 100 mA). Haven’t compared dropout voltages yet – if either one can deliver 3.3V from a 3.7 V LiPo battery or even from 3.6 V NiMh’s, then that would be a plus.