The subordinate technical scheme is essentially a technical scheme consisting of the technical features of the cited claim and its additional technical features. Therefore, these two applications are essentially different technical solutions.
In essence, divisional application is to protect different inventions separately, so that others can choose the corresponding patent for infringement litigation regardless of whether they only use one or two, which can reduce the risk of technological achievements being evaded by others. Two applications, indicating that I want to protect two major inventions.
The additional technical features of the two subordinate applications are the same, which may be that the invention represented by this subordination is not as important as the additional technical features of the two exclusive rights.