Open a MacDraw II file with multiple-line text blocks in MacDraw Pro. The line spacing will be different if the text is Times 12 or Helvetica 12. Other fonts and sizes appear to be unchanged between MacDraw II and MacDraw Pro. The line spacing can be changed in MacDraw Pro to match the line spacing in MacDraw II by using the Paragraph command in the Size menu, then resetting the line spacing in points. Here is a comparison of line spacing between MacDraw II and MacDraw Pro:
MacDraw II MacDraw Pro
Times 12 12 pts. 14 pts.
Helvetica 12 14 pts. 13 pts.