You can copy an EBS boot AMI from one EC2 account to another using the technique I wrote about here:
Copying EBS Boot AMIs Between EC2 Regions
http://alestic.com/2010/10/ec2-ami-copy
The commands I list are for copying an EBS boot AMI from one region to another, but if you simply use the right commands with different accounts instead of different regions, you can accomplish your goal. Note that you'll have to upload your personal ssh key to both accounts following these instructions:
Uploading Personal ssh Keys to Amazon EC2
http://alestic.com/2010/10/ec2-ssh-keys
Copying S3 based AMIs from one account to another is a bit convoluted and involves commands like:
- ec2-download-bundle
- ec2-unbundle
- (switch accounts)
- ec2-bundle-vol
- ec2-upload-bundle
- ec2-register
Alternatively, you hopefully documented the exact steps you took to create the original AMIs. Simply follow these instructions to create the AMIs in the new account.