If you are intending to match them up with 1/72 plastics the answer is, it depends....
I have owned Newline 20mm Napoleonic British which were shorter than their 1/72 brethren and needed a boost on their base. I also owned some of their Portuguese which were slightly larger and a better fit with existing plastics. They are all by the same sculptor I believe, but at some stage the figures increased slightly in overall size. How one finds which were later, bigger sculpts I'm not sure. If you can, it may be worth sending them an email or making contact via Facebook if you use it.
I have an older video on YouTube which includes images of them mixed in with plastics:
The command stands in the British and Portuguese units in the thumbnail are both from Newline.
Sorry I can't be of further help, but the miniatures are no longer in my collection.