Is this spring compatible with both natural gas and LP systems

This 36-inch

There is no functional or technical difference between these two part numbers

Broad Compatibility: Direct cross-reference for the Barber Colman 2472-010

it ensures reliable shut-off and consistent flow rates under varying system pressures

Trane FAN1836 Fan Blade Els PW 17895 Is this spring compatible withThe Trane FAN1836 is a professional grade condenser fan blade engineered for heavy duty HVACR applications, specifically within packaged rooftop units and large scale condensing systems. Featuring a 24 inch diameter and a 24 degree pitch, this 3 blade aluminum assembly is optimized for high volume airflow and thermal management. Designed with a standard 1 2 inch bore, it facilitates a secure press fit or set screw mounting on compatible motor shafts.