Hello,
There definitely wouldn't be any harm from using a consistent bio and definitely help your branding but from an SEO perspective I could see varying it slightly based on what page or site it is on. Fore example to help build more direct links to your Prestashop services landing page I would create a bio flaunting your expertise in Ecommerce and Prestashop and choosing the anchor text accordingly. On the other hand if you're trying to increase your PA on your SEO landing page and your guest post is SEO related then why not make the link in your bio that much more relevant?
I think creating 3 slightly diff bios that funnel link juice based on your priorities is a good idea.
Milosz