Forgot to mention - when shrinking the graphic - Make a note of the numerical value of the dimension you have changed - write it down somewhere - use computer and save in a text document (maybe the one you do the lyrics and chords in (then delete it before saving file with a new name).
If you scale ALL your imported chord using the same dimension, they ought to match on the lyric layout.

Of course, if all you need is something neater and more printable than a hand drawn scrap of paper, you don't actually need them identical size, it just looks nicer if they are. Of course - if it was for professional publication, you might want it more precise, but personal use is a different bag.

Quack!
GtD.