Hi H.,
Our kids are the same age (my son will turn 1 this month), and I can totally relate since my kids are developing really differently. I obsessed about my daughter's development because she never crawled and walked at 13 1/2 months (which is perfectly w/in normal range); seeing all her little buddies walk at 9-10 months made me anxious. It really shouldn't have been a surprise, though, since I swear she talked at birth-(:-a dozen words before 1, sentences by 15 mos.
My son, on the other hand, was crawling at 7 mos., pulling up by 9, and is happily hanging out in the cruising phase. He is SUPER active and never stops jiggling and moving around. My daughter, on the other hand, sat on her chubby butt and waited for things to happen. (: He says a couple of words but seems to be all action no talk-she was all talk, no action. It's interesting to see how totally different 2 kids from the same family can be.
Now that I've learned to do developmental assessments with kids for work, and have seen the full range of normal development in 00's of kids, I must say...don't worry! Your kids are totally fine. Just enjoy the phase they're at-before long they'll be doing whatever you were anxious for them to do, and the worry will be forgotten.