Why are you not also asking if it is necessary for the train to stop at Patricroft?
A Wayfarer / Saveaway combination is unequivocally valid Liverpool to Manchester on the Chat Moss route stopping at Newton-le-Willows.
Technically there is a gap between a Saveaway and a GM Rail Ranger unless you argue that both are valid beyond the last station / stretch of track at which they are valid - e.g. Saveaway to Newton-le-Willows, GM Rail Ranger to Patricroft / Parkside Junction.
There is some previous discussion here about the Wayfarer / Saveaway option where a view is expressed that it wouldn't be valid on a train that didn't stop at Newton-le-Willows (or Earlestown).
https://www.railforums.co.uk/thread...-to-manchester-adventure.112529/#post-2088136 although this map is quite interesting
https://tfgm.com/public-transport/train/ticket-area-map in that the valid routes go right up to the boundary beyond Parkside Junction and this one appears to go beyond Newton-le-Willows
https://www.merseytravel.gov.uk/Site Documents/MerseyrailNetworkMap.pdf.