The CT7 vs T700 story may have other issues as well. The inlet separator (a vortex inertial system) was part of the helo mission requirement for the US Army - early 1970's design. But it had a gear-driven blower to make it more effective. This cost some useful output power, but extended the engine useful life in sand and dust.
The CT7 turboprop was designed a few years later, the vortex system and the blower were removed and replaced with an eductor in the exhaust. More HP became available.
Seems to me this has some effect on what inlet conditions the engines could accommodate.