I've been using Terragen since version 0.9.43, though I do have version 3 as well.

The one thing I was able to do a couple of times was to create a landscape I was happy with, export it, and import it into Bryce, though I haven't been able to successfully do it consistently.

Here's 2 old renders I did years ago that I have on the 3rd page of my gallery here:

Fiery Sunset

Across The River

Here's one of the successful import to Bryce renders:

Terragen To Bryce

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OK . . . Where's my chocolate?

Butterfly Dezignz