The filters are Fleetguard HF35503, HF30730, and Donaldson P566400. On one of the Fleetguards it says TWA MICRON @ different BETA numbers where the other one just says Particle size at different BETA numbers. Do these mean the same thing but are just worded differently, to where I should just use the one that has the smallest micron number matched up with the same BETA number, or is there a difference? The Donaldson just says EFFICIENCY BETA 1000. I know these are hydraulic filters but figured the information would apply the same as if they were engine oil filters. If someone could help explain this I would appreciate it!