Not sure how you'd do it in Gimp, but in Photoshop....
1) Open your animated gif. It will open as a single image with multiple layers.
2) Open the other gif, in the layer menu choose duplicate layer, set the destination as the animated gif document, click ok.
3) In the anim gifs document choose 'Save for web' from the file menu, tweak the transparency, colour depth and slide duration.
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