Yes, VCF files created in different vCard versions, such as 2.1, 3.0, and 4.0, can be merged without errors if the merging process supports all formats properly. But if you think of doing it manually, you cannot merge a bulk VCF contact file properly because the manual method is very time-consuming and there are risk of data loss. So these issues usually occur when basic or manual methods fail to read certain contact fields correctly. To avoid problems, it is recommended to use a solution that automatically detects and handles different vCard versions. I'm using this
WholeClear Merge vCard software, which ensures that phone numbers, email addresses, and other details remain properly structured. You can easily
merge VCF files from different versions and platforms while maintaining data accuracy with the help of this expert tool. It works offline and supports all Windows versions. For more information, you can download it for free and freely use this solution with a demo version.