No. Immunotherapy is not homeopathy. Allergy vaccines (under the tongue or injections) are produced from standardised allergens, contain a known amount of the major allergen and they have been evaluated in large number of clinical studies.
Immunotherapy extracts contain high concentrations of the allergen (allergic protein) and the aim is to build up to a high dose. In contrast, homeopathy is unproven in the treatment of allergic diseases, and relies on progressive dilution of the allergen. The “most potent” homeopathic treatments contain no allergen.