I asked a bunch of these questions recently..
first off your 1995 T-444E should NOT use a standard ELC coolant like used in the newer Engines...
secondly.. these Pre-mixed coolants are the initial charge.. something like FleetCHarge.. its a "pink" coolant and has SCA built in... accoreding to the fleetcharge people you *CAN* mix it with green coolant however its not recomended as it makes things hard for someone else to check and know what coolant is in your bus.. as well as it makes the coolant look Wonky, so you lose some abilities for visually inspecting coolant for possible engine issues in the future..
your Spin-on Coolant filter is designed to "maintain" the levels of SCA in your coolant throughout its life.. (theres a recommended interval of coolant and filter change).. when replacing all of your green coolant with green coolant you must add an initial SCA charge to bring the levels up to where they need to be (use test strips).. then tje coolant filter maintains the levels assuming you arent leaking coolant on a regular basis...
if you drain and refill with a precharged coolant such as Peak fleetcharge. then you dont need that initial SCA charge, but will still use an SCA charged coolant filter to maintain the levels...
ELC coolants dont require SCA charge at all and use a dummy non-SCA coolant filter.. however not all engines are compatible with these newer coolants.. in the case of the 444E / Powerstroke 7.3. International put out a serial number break where ELC coolants are acceptable.. (somewhere in feb 1999)..
you CAN use a PolyOrganic type coolant in your older 444E, im using one by AmSoil in my 444E( mine is newer buit the poly works in all).
the video below shows you on the 444E what coolants are acceptable for what years.. remember ford Powerstroke 7.3 was built by International and the fluids used in it are the same cutoffs as the powerstroke 7.3, so your 444E follows the Pre-1999 ford 7.3
-Christopher