would be willing to pay for tool if not readily available. does anyone have any ideas?
I don't know any tool which accept 2
batch of address as input. But if you don't mind workaround, you could do this
1. Use publicly available tool (which usually show address group). Few example that i know,
2. Enter each address of an batch.
3. Download the result for each address.
4. See whether the result contain address from another batch.