Can Salbair Be Replaced In Stead Of Asthalin For A Toddler With COPD?

My children, 4 yr 6 months, having COPD since 3 years. Taking budecort 100 daily two puff twice. When breathing trouble increases, he has been prescribed to use Asthalin for few days. Can replace Asthalin with Salbair I. If yes then plz let me inform about its doses for him