They are different people, Arturo (cnc4pc) is in Florida and john keling is in chicago.
cnc4pc only recently started reselling keling products and vice versa.
Many websites offer items from other sites and these 2 offer items from several other companies, some just drop ship..
You pay a little more to get the one stop shopping convenience.
I get approached a lot but am not interested in dealing with it.
Arturo will support items he makes but expect him to defer you to john for his items.
And you can't expect a lot of support from john since he doesn't make the stuff, it comes from china.
There are plenty of other suppliers, gecko drive, DMM, Homann that might speak your language.
Hoss