They're basically the same, with chlorhexidine gluconate as the main active ingredient, backed up by a secondary one (which is phenol in Germolene or cetrimide in Savlon). All of those ingredients are antiseptics (with the secondary ones also acting as anaesthetics to lessen pain or irritation).
If spots are caused by bacterial infections (rather than a virus or, say a hormonal problem) both creams might assist with clearing those infections. However they might also block pores, possibly making matters worse.
Many 'medical people' (such as doctors, nurses and pharmacists) regard old-fashioned antiseptic creams (such as Savlon and Germolene) as having very few beneficial effects and possibly having some negative ones (such as blocking pores and, worse, inhibiting the growth of new healthy tissue). A nurse, who ran an advanced first aid course that I was on, stated she'd like to see them banned from sale and a pharmacist I know supports that view. Forget about using either of them and speak to a pharmacist to obtain something far better suited to your problem.