Open both files in Photoshop, File > Automate > Photomerge.
Thank you, but doesn't work.
I assumed there was an overlap.
If not, you just have to expand the canvas of one and copy and past the other as a new layer. If there's no overlap, you'll have a gap to fill. Content Aware Fill might work.
This isn't really relevant to the Camera Raw forum. You'd get lots of suggestions in the Photoshop forum.
I follow your suggestion. I've got the image which I wanted. Thank you.
Sorry for inconvenience created for overstep the boundary of specific forum.