Please help...in finding true info

Just like in Allopathy we have substitute for variety of medicines, If Ampicilline is not available we can substitute it with Erythromycine. If Novalgine is not obtainable we can replace it with sistalgin. If avil (histamine tablet) is not on hand we can use incidal instead of avil. All of them more or less same affect over the body but actually all of them have different salt inside.

Is this formula for substitution of medicine / remedies applicable in alternative homeopathic therapy.