how you and experts are going to demonstrate that an inner turbine wheel on a JT15D is some how manufactured to a lower standard then say your typical airline engine.
Could it be that the designers fashion an engine to meet the expected usage pattern - metallurgy (single crystal blades), plasma coating blades with exotic materials, cooling (plasma drilling passages, casting blades with passages), active blade clearance. Technology costs money, and the usage pattern of JT15 powered aircraft was probably designed with 500 hours per annum in mind. Calendar time likely to come up before hours or cycles. Could it be? Nah, not a chance.
Formula One guys should buy their tyres at Harrys Cheap Tyres, they do the same job, both just bits of rubber on a wheel.