Taylor of LondonTECHNOLOGIES INC R-0871-E FAS-DPD TITRATING 16 OZ

What is the difference between r-0871e, r-0871c,ect. is it the same regent?

What can you use to ensure you get the same size drops from this larger size as the 2oz bottles?

Can I buy R-0001 and R-0002 in 16 oz bottles?

I do not currently have the 2oz bottle. Can you tell me if the knozzle is removeable from the 3/4 oz bottles? Thanks!