The housing is glass-filled PBT rated UL94 V-0, which means it's acceptable inside any equipment enclosure that requires a flammability rating.
The B3P-VH-FB-B(LF)(SN) is the same part with a different process suffix — lead-free and tin-plated finish. Same 3 positions, same 3.96 mm pitch, same 10 A rating, same 4-wall shroud, same locking ramp. It drops into the same board footprint and mates with the same VH receptacle housing without rewiring. If your BOM already calls out the (LF)(SN) variant, this one is a direct functional substitute; the only difference is the manufacturing process code.