PGN 6000-2RS Sealed Ball Bearing - 10x26x8 - Lubricated - Chrome Steel (10 PCS)

Will these replace the 6000Z bearings

I am replacing a bearing that says "6000lu" on the dust covers. what does the "6000" stand for, and what does "lu" signify?

Are the rubber seals "contact" lu, "low torque" lh, or "non-contact" lb type?

These have more drag than I was expecting. Can the grease be thinned or is a different model more suitable?