They both are pretty large plants ,I would have them at least 4 feet apart. Some plant do not like to be bunched tightly.
How Far Apart Do Squash And Cantaloupe Plants Have To Be?
I don't know for sure, but we planted them in the same garden one year and came up with squatermelon--they cross-pollinated!
Ill tell you what you do!!! You go buy a life on ebay!!!!!!