Is it possible to have two headings at the same level, with two different styled numbering?
1.2 heading 1 (1.2 in black)
1.3 heading 2 (1.3 in red)
1.4 heading 1 (1.4 in black)
Of course, you can always customize the text in place.
First, select the whole line by clicking on the left margin:
Then, choose the color:
Now all the text is red! We need to change the text only back to black. Select the text from left to right, but move back a bit to exclude the "newline" character (?). Notice the difference with the one above:
Now choose "Automatic":
Here are 2 versions, since not sure what you asking for.
Just select the text in heading and choose the color.
A style separator would probably work for this. Use Control Alt Enter after the number and use a different style for tHe number and the text.