Input script difference What is the difference or the meaning of these two headers of input scripts?

1) 4730440220
2) 4830450221

I see a lot of them in transactions but I don't understand the difference.

Thanks
For most transactions, the input scriptSig will be a push of the signature followed by a push of the public key. The "push" part is done with script opcodes which say how long it is, and the signature is encoded as DER.

47/48 are the push opcodes, to say 0x47 or 0x48 bytes will follow. Then the signature is encoded as:
0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S] [sighash-type]
So the total length in your examples is either 0x44 or 0x45, and the R-length is 0x20 or 0x21.