不完全一样。
1. memo是一种较为短小精悍的文书，要求结构紧凑，内容要点明确，因此相对于写信而言，memo更注重简洁明了的表达形式和逻辑。
2. 但是，memo和写信一样，同样需要注意要素齐全、格式规范，如分别标明memo的发起人和接收人、主旨、正文、附注等内容，并按照一定的排版要求进行编辑排版。
3. 此外，memo和写信一样，都需要注意正式性和礼貌性，特别是memo往往涉及到组织内部或跨部门之间的协调，更需要注意语气和用词的恰当性。
综合而言，memo与写信有相似的要素和格式要求，但在表达形式、撰写风格和内容要点等方面，两者是有所区别的。
memo的格式跟写信一样吗
不一样。
一、memo（备忘录）的介绍
memo（备忘录）总体上应包括这几部分：To, From, Date, Subject以及正文部分。具体而言：
1、To: 备忘录对象
如果具体到人，最好写出全名，尤其不能“重名”，如Bill Tom，Bill和Tom都是名(Given name)，而不是姓(Family name)，一个简单的处理方法就是use others name，比如男名Bill Gates,Michael Scofield, Jay Chou或女名Britney Spears, Jennifer Aniston等；
若显示关系亲密，还可以把名字缩写，比如B. Gates, M. Scofield, J. Chou, B. Spears, J. Aniston等；如果写给上级，还应该加上尊称甚至职位，比如Mr. Bill Gates — Managing Director, Mr. Jay Chou — Art Director等；
现代商务写作中流行开放标点(Open Punctuation)，即标点不影响理解的时候可以不用，所以Mr./Ms./Mrs.后面的省略点也可以省去，简单写成Mr/Ms/Mrs；最好不要省去名字。
2、From: 备忘录作者
要点同上，一般不用尊称，只有对方不知道自己身份的时候才后缀职位名称。
3、Date: 日期
BEC属于英联邦国家的考试，日期的写法一般为日、月、年，比如7 December 2002，注意月份用英文而不是数字，以免和日期混淆，可以缩写，比如将一月写作Jan(也可以用开放标点)。
二、memo的范文:
From: Olive HR Manager
To: All staff
Date: 12 June, 2008
Subject: Appointment of Francisco
Here we announce the appointment of Mrs. Francisco as our new Sales Manager of the Headquarter. She will be starting her job next Monday morning. There will be a small welcome party by 9:00 that day so everyone please be on time.
三、Memo备忘录写作方法:
写作之前要考虑以下因素：
Who is going to read my memo?
What has the reader already known about this?
What does the reader need to know?
How is the reader going to respond my memo?
四、范文示例
To: All Staff
From: Bill Gates
Date: 7 December 2002
Subject: Staff Reward
The profits of our company this month went up 10% compared with the same period last year, due to your hard work and long working hours. I would like to thank you for your long devoted service. A trip to Hawaii has been arranged next month as a prize. Enjoy!
memo英文格式怎么写？
memo，意思为备忘录，英文格式如下：
TO: (readers' names and job titles)
FROM: (your name and job title)
DATE: (complete and current date)
SUBJECT: (what the memo is about, highlighted in some way)