Just back from a WM trip, as I posted the current FE4967 is the 'standard 4967' application size, ~3" long. Which would be the left one in the OP. At some point FB must have been using a 4386 application size calling it the FE4967. Normally when a manufacturer or end user consolidates applications it's to the shorter size ie, 6607 for 7317, 4967 for 4386. For whatever reason it appears First Brands was doing the opposite for FE4967, odd. So, to answer the OP query, I would say FB now using the correct application size for the FE4967. In this specific case, I'd think of it less as cost cutting, more as now using the correct application size filter. As an aside, I did not see any Fram filters in the 4386 size, even though excepting FE they are listed on their website. I do see a PH4386 available at Lowes, that said perhaps FB is consolidating all 4386 to the 4967 which imo would be a cost cutting move.