Is it permissible for charitable organizations that collect money to buy winter blankets for the poor in cold regions to spend part of this money on buying other items these poor people need, knowing that the intention is the same?

Funds collected for a specific purpose (such as winter blankets) may not be spent on another purpose, unless the original purpose has become impossible or unnecessary, and another need remains. It is preferable to change the designation to "winter aid" to encompass broader needs.