Ontario Randall and ESEE have never been the same. Randall is totally different. ESEE had Ontario making the RAT products for awhile but they had some sort of parting of the ways and now Rowen Mfg makes the ESEE knives (except for the Light Machete which is made by Imacasa). So Ontario and ESEE formerly had a relationship. I came into the ESEE world long after this had all shaken out so I am somewhat of a "snob" in terms of ESEE vs the Ontario RAT products today but quite frankly I have nothing to actually back that up. I believe that in general the ESEE products are more highly regarded than the Ontario RAT products.
By the same token, I believe that the Ontario Ranger products are well regarded on this forum.
Randall Knives are made by Bo Randall or his descendants. ESEE is a fellow named Jeff Randall who I believe is not closely related if at all...and is not affiliated.
This topic is covered all over the place here and you'll have to do a lot of searching but off the top of my head, I believe this to be true. YMMV.