As far as pest control goes, not really, the JV situation is a little overkill for reference sharing.
If your setting up a joint venture, then generally it would be to share something and build something bigger than the sum of the parts. From your description it sounds like your each still going to run your own businesses and just sharing leads / subcontracting. If this is all your looking at then I would just have an agreed "fee per lead" that you agree to pay each other when the leads come in.
When would I consider a joint venture?
If the JV is going to have its own brand name and do the marketings, sales, have the phone number that everyone knows and your two companies are the subcontractors to it. In this istance you would both put in money to setup the markeing brand name, the call centre with the appropirate scirpts and staff to manage your respective calendars.
Your seperate companies are the ones doing the job and taking the liabrilty, the joint venture would be dealing with the client and taking a booking fee and dealing with the paperwork.
You could then grow the joint venture and subcontract lots more pest controllers under the brand name allowing it to grow.