应该是一样的意思,字面上看来是一样的意思 Shall we and Can we 但是shall we会听起来比较礼貌
may 旨在授权(可以做什么),shall表示命令(应当)
参考网站:https://zhuanlan.zhihu.com/p/66300045
We use 'may' to give and ask for permission to do something in a formal context. 'Shall' is used to talk about formal obligation in documents and formal contexts.