7:73 To the Thamud people (We sent) Salih, one of their own brethren: He said: "O my people! worship Allah. ye have no other god but Him. Now hath come unto you a clear (Sign) from your Lord! This she-camel of Allah is a Sign unto you: So leave her to graze in Allah's earth, and let her come to no harm, or ye shall be seized with a grievous punishment.
5:103 Allâh has not instituted things like Bahîrah (a she*camel whose milk was spared for the idols and nobody was allowed to milk it) or a Sâ'ibah (a she*camel let loose for free pasture for their false gods, e.g.*idols, etc., and nothing was allowed to be carried on it), or a Wasîlah (a she*camel set free for idols because it has given birth to a she*camel at its first delivery and then again gives birth to a she*camel at its second delivery) or a Hâm (a stallion*camel freed from work for their idols, after it had finished a number of copulations assigned for it, all these animals were liberated in honour of idols as practised by pagan Arabs in the pre*Islâmic period).*But those who disbelieve invent lies against Allâh, and most of them have no understanding
1. No, both camels are not signs/miracles. Salih's camel was miraculous because it was produced from a boulder and was gigantic. The "saibah" is a random superstition of the arabs tolet a camel travel around loose with nothing on it.
2. In what way was Salih's camel set free? For it never belonged to any human.
3. Even if we think that they (the camels) are the same in those aspects, Allah swt is saying that He did not institute this as
a) a practice to be observed
and b) To be dedicated to their idols, which they believed would bring them closer to Allah (see Az-Zumar 39:1-5
4. Saalih was a Prophet who produced a sign. The "saibah" was a pagan custom. The two things are incomparable.
5. Even in the first verse, it makes clear that it is condemning any practices devoted to 'gods' besides Allah.