The spare CG S61's are not standard S61's. They do not have the LN400/450 auto hover system but they do have FLIR, additional search lights (they are not standard S61 lighting), additional navigation equipment etc. They're not great and need replacing like the Sea Kings but they're not standard S61’s.
Lets remember that each base will soon have two new identical full SAR S92's or AW139’s (with the exception of Portland which will have one AW139). This is all good news for SAR and should all happen in the next 12 months (allegedly) and this whole debate can then be put in the archives.