A peptide bond is the chemical link between amino-acid units in a peptide. The presence of that link tells you something about the class of compound. The complete sequence and any structural modifications are what help distinguish one peptide from another.
The link and the sequence answer different questions
IUPAC describes peptides through the bonds formed between amino-acid-derived units. A sequence records the order of those units. Knowing that a material is a peptide therefore gives less information than knowing its full name and sequence.
Read the IUPAC peptide definition for the formal chemical terminology. Use a material’s own specification for its particular identity.
Why short labels need context
Catalogue abbreviations can be useful, but they are not a replacement for a complete item description. Fragment numbers and modification names should stay attached to the product identity. A familiar-looking abbreviation may point to a different material if that extra information changes.
For example, the catalogue distinguishes CJC-1295 without DAC 5mg from a CJC-1295 with DAC 5mg listing. Read the full designation rather than selecting an item by the shared part of its name.
A sequence does not establish every product property
A stated sequence is an identity reference. It does not, by itself, establish a supplied sample’s purity, concentration, storage history or suitability for a particular assay. Those are separate questions that need the relevant product information and laboratory procedures.
Keep the ordering decision specific
Match the product name, labelled amount and specification to the item the laboratory actually requires. If two entries differ, investigate the difference rather than assuming the names are synonyms. For the broader terminology, return to what peptides are.