the "same type" cable is an industry standard cable (cat5) with an industry standard connecter/socket (rj45)
it is used in many many things... including your computer and your cable modem....
neither of which offer any compatibility through that connection.
you did good to ask, now you know. it's that simple.
Thanks for your replies....Its just a bit odd that these two Line 6 products have the same kind of connector on them and it does mention 'limited compatibility'....and yet there is no specific warning anywhere in the documentation or product videos that warns you not to connect them.