you just need to give some time to the new OSPF process to build the OSPF adjacencies and have a complete LSDB.
I would do the changes in the following order
0) check with show ip ospf neighbors what are the OSPF neigbors of the router
1) router eigrp 2
no redistribute ospf 3
2) no router ospf 3
3) router ospf 1
4) check with show ip ospf neighbors that all neighbors are listed and in the same state as at point 0)
5) router eigrp 2
redistribute ospf 1
The question is that if two OSPF processes have network commands for the same subnets in the same area the router is not able to understand if received hellos or other packets are for process 3 or for process 1. So likely with your procedure new OSPF process will start to talk with external world only after deleting the old process.
I agree with the suggestions from @Giuseppe Larosa. And to specifically address the questions in your original post I do not think there is any need for clearing eigrp processes and no need for clearing ospf processes.
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