If someone else comes across this post, I figured out a brute force solution.
When the importer is running, it imports posts from Tumblr starting with the most recent and working backward chronologically. So I decided I would let it import posts until it got to the point where it caught up with the posts I already had in my WordPress blog.
To force the import to stop, I cleared my data right when the import was at the point I needed it to stop. The option to clear data and abort the import is found in the plugin page in the WordPress admin area.
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This reply was modified 2 years, 6 months ago by
goodolvic.
@goodolvic the importer is supposed to already prevent importing duplicate posts. If you have a spare WordPress site handy you might try importing twice to confirm; I did this and it properly avoided importing posts that I had already imported.
The plugin doesn’t offer a way to skip posts but this might be a nice suggestion to add: provide a way to add a filter to limit what posts are imported; though that would be more for the ability to add some PHP code to do that.
Ah yes I knew that, but the issue was the posts I already had in my blog were manually transferred one copy-paste at a time, instead of being created by the plugin. So if I attempt to import the entire blog then I’ll end up with duplicate posts alongside the manually transferred ones.
But I agree, adding a filter for selecting which posts to import would be a great addition (whether by date range and perhaps tags).