All word processing programs have the same basic functions. What's important is that students understand what those functions are - both by name and what they do. For example, fonts, paragraphs, and documents can be manipulated in various ways. WP programs have means for creating headers, footers, columns, tables, etc.
Text is manipulated by highlighting it.
I find it helpful to have students predict what they think they would find in a particular menu. If students understand these concepts, they can jump from software to software with only a little loss of time, finding where functions are located in a particular program. I use WP as an example, but it's true for any kind of basic software from spreadsheets to paint programs. Hope this helps.