Maybe someone else can chime in with the chemistry specifics, but some brake fluids are not compatible with some lines/seals. I'm pretty sure that mixing the wrong types can cause the fluid to become a paste/grease consistency that will not be good news for your brakes or braking ability.
In general, unless you know you have a need for 'higher boiling point' rated fluid in your specific brake fluid's chemical family (i.e. racing, heavy trackday usage, etc.), I wouldn't bother "upgrading". Its MUCH more important to change your brake fluid regularly (i.e. yearly or every other year at the latest), and to have the system bled properly at all times.
When you replace the brake lines, if you have to remove a 'banjo bolt' fitting, always ALWAYS use new sealing rings.
Put rags around and under drip areas - brake fluid and painted/powder coated finishes are not happy with each other. If you do have a spill, flush the area with water (you might invest in a simple spray bottle with water in it).
As always, YMMV...
