Normally the question asked is 'What is the difference between Joint Venture and Consignment?'. Interestingly, you are asking similarity between the two. Actually there are not many similarities between the two. Following can be said to be few similarities:
1. Joint Venture and Consignment both are vehicles for doing business.
2. In both at least 2 persons are involved.
3. Both arrangements are more or less temporary in nature.
4. Both the chapters are in course of CPT (in a lighter vien)