Concat Different Dimension Videos Into One Video

[peteronwork]

I'm trying to concat two different videos into one video. But those videos are of different dimensions and hence FFMPEG not able to do that. Here is the error output:

[Parsed_concat_0 @ 000002872b688100] Input link in0:v0 parameters (size 720x1280, SAR 1:1) do not match the corresponding output link in0:v0 parameters (1920x1080, SAR 1:1)
[Parsed_concat_0 @ 000002872b688100] Failed to configure output pad on Parsed_concat_0