A draft version of the pig (Sus scrofa) genome has recently been completed. See NCBI Pig Genome Resources
I haven’t seen any overall % identity number, but one can say “The pig genome is of similar size (3 x 10^9 bp), complexity and chromosomal organization … as the human genome.” This is from http://www.genome.gov/Pages/Research...eSEQ021203.pdf
The human – chimp comparison is well known. If you compare the single nucleotide polymorphisms (SNPs), the genomes are a little less than 99% identical. This identity between two unrelated humans is about 99.9%. Neither of these comparisons include the loss & gains of DNA termed “indels”. These differences are also called copy number differences & there isn’t an easy number of expressing this difference. An example of a copy number difference between humans is the gene responsible for color blindness. One way of making this comparison is to identify regions which are highly similar from the genetic maps. These regions are called “syntenic segments”. The expectation is that the size of the regions will decrease the further apart (time since the last common ancestor) the species are.
So how similar are our genes to a pig or a chimp? For this question I choose 1 gene. I compared albumen gene. The human (GenBank: NM_000477) to the chimp (GenBank: XM_517233) and to the pig (GenBank: NM_001005208) albumin mRNA sequences. I compared the sequences pairwise with program called BLAST (Basic Local Alignement Search tool) at the NCBI (BLAST: Basic Local Alignment Search Tool
The Human vs Pig albumen genes are 83% identical (Identities = 1739/2091, Gaps = 80/2091 (3%)).
The Human vs Chimp albumen genes are 99% identical (Identities = 2119/2136, Gaps = 0/2136 (0%)).
The Chimp vs Pig albumen genes are 82% identical (Identities = 1668/2017, Gaps = 84/2017 (4%)).
You can make a nice argument for evolution with your question. If the pig, chimp & human albumin genes were the products of a separate creation there would be no reason to believe that the ~350 nucleotide differences between the human and the pig would the same as the ~350 differences between the chimp and the pig. I haven’t done this multiple sequence alignment. It might never have been done. BUT, it is easily done & I would predict, based on the evolutionary relationships, that >90% of the differences with the pig will be shared between the human & chimp sequences.